If y=78 when x=12, find y when x=21

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x

The area of a circle is equal to 1 dm². find the radius of the circle.

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?